Many of the companies selling sex hormones are making money by selling sex hormones in a different form to other hormones. These companies don't list the form of hormones they sell, or even their name, in the ingredients list. These companies sell their products under the names of hormones with different names, to the public. In these products, sex hormones that aren't the same as hormones from human cells, can be added in. For example, if a product says "Hormone" without any hyphens in the name, it is referring to a different hormone. For example, some sex hormones are testosterone and estradiol. These two are usually combined in some of the products you'll find in pharmacies. Other sex hormones are estrone and estradiol. Estradiol is the male sex hormone, and estrone is the female sex hormone. There are many companies who offer both these hormones, and the companies can be confused because the two hormones often seem to be the same. To make things clearer, here are a few common hormones: T, D, and E are called estrogens and testosterone are called androgens. The T hormones are more similar to the male hormones, but it's important to know which ones you're buying.